<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>图书管理系统</title>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css">
</head>
<body>
<div class="container mt-5">
  <h2>Login</h2>
  <form action="/login" method="post">
    <div class="mb-3">
      <label for="username" class="form-label">Username</label>
      <input type="text" class="form-control" id="username" name="username" required>
    </div>
    <div class="mb-3">
      <label for="password" class="form-label">Password</label>
      <input type="password" class="form-control" id="password" name="password" required>
    </div>
    <button type="submit" class="btn btn-primary">Login</button>
  </form>
</div>
</body>
</html>